Experts are warning of a new worm which spreads via USB keys in a reversion to the earliest methods of virus distribution. SillyFD-AA installs itself onto systems and puts a message in Internet Explorer reading 'Hacked by 1BYTE'. It also installs an autorun.inf on any removable drives, such as USB sticks or floppy discs."USB keys are becoming so cheap that marketing people are prepared to use them as 'throwaways' with the aim of securing sales leads," said Graham Cluley, senior technology consultant for Sophos.

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